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Book Review: Ruby & Sapphire: A Gemologist’s Guide
Review of Ruby & Sapphire: A Gemologist’s Guide
Photoluminescence Mapping of Optical Defects in HPHT Synthetic Diamond
Demonstrates the importance of this method in identifying diamond treatments, based on the
analysis of PL maps acquired from a brownish orange HPHT synthetic diamond.
Carbonado Diamond: A Review of Properties and Origin
Presents a detailed examination of about 800 samples of carbonado diamond from Brazil and the Central African Republic, including possible models for its genesis.
天然ダイヤモンドにオーバーグロースした合成ダイヤモンド
Analysis of a diamond graded Fancy blue revealed a CVD synthetic overgrowth on natural diamond.
Geology and Development of the Lomonosov Deposit, Northwestern Russia
Reviews diamond discoveries at the Lomonosov deposit, as well as the geology of the Arkhangelsk kimberlite province.
Christmas Tree–Shaped Internal Feature In Diamond
A laser manufacturing remnant in a Fancy yellow diamond creates a unique specimen.
Dyed Yellow Beaded Freshwater Cultured Pearls Imitating South Sea Cultured Pearls
A yellow cultured pearl necklace is compared to the work of a producer specializing in freshwater pearls of all colors.
Sapphires from Northern Ethiopia
A new source of sapphires is found in the Tigray region of Ethiopia.
Mysterious Iridescence in Aquamarine
A rough aquamarine crystal shows an unexpected phenomenon.
Diamond with Unusual Fluorescence Distribution
A submission to the New York lab yields an unexpected reaction to long-wave UV radiation.
Colorful Chatoyant Glass
A devitrified glass reminiscent of Victoria Stone is seen during the Tucson gem shows.